Deep Dives,Long Dives and Gradient Factors

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ianr33

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Location
Wah Wah Land
# of dives
200 - 499
Just wondering how those of you using Gradient Factors alter those factors with increasing depth or time.

Biggest dives I do are around 200 feet/20 minutes on 20/35 , or 100 feet /90 minutes on 32%. (plus deco gas(es) of course)

Have been using GF 30/85 for a while.Never felt the slightest twinge or any undue fatigue after a dive.

My understanding is that while I would be getting out of the water with my leading compartment at 85% of its allowed pressure on any dive,that may be a very different compartment for different dives.

Just supposing (hypothetically) I wanted to do 300 feet for 15 minutes or 100 feet for 200 minutes. What might appropriate Gradient Factors be?
 

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